class/WindowsBase/ZipSharp/UnzipReadStream.cs

   1 // ZipReadStream.cs
   2 //
   3 // Copyright (c) 2008 [copyright holders]
   4 //
   5 // Permission is hereby granted, free of charge, to any person obtaining a copy
   6 // of this software and associated documentation files (the "Software"), to deal
   7 // in the Software without restriction, including without limitation the rights
   8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9 // copies of the Software, and to permit persons to whom the Software is
  10 // furnished to do so, subject to the following conditions:
  11 //
  12 // The above copyright notice and this permission notice shall be included in
  13 // all copies or substantial portions of the Software.
  14 //
  15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21 // THE SOFTWARE.
  22 //
  23 //
  24
  25 using System;
  26 using System.IO;
  27 using System.IO.Packaging;
  28
  29 namespace zipsharp
  30 {
  31         class UnzipReadStream : Stream
  32         {
  33                 long length;
  34
  35                 UnzipArchive Archive { get; set; }
  36
  37                 public override bool CanRead {
  38                         get { return true; }
  39                 }
  40
  41                 public override bool CanSeek {
  42                         get { return false; }
  43                 }
  44
  45                 public override bool CanWrite {
  46                         get { return false; }
  47                 }
  48
  49                 public override bool CanTimeout {
  50                         get { return false; }
  51                 }
  52
  53                 public CompressionOption CompressionLevel {
  54                         get; set;
  55                 }
  56
  57                 public override long Length {
  58                         get {
  59                                 return length;
  60                         }
  61                 }
  62
  63                 public override long Position {
  64                         get { return NativeUnzip.CurrentFilePosition (Archive.Handle); }
  65                         set { throw new NotSupportedException (); }
  66                 }
  67
  68                 public UnzipReadStream (UnzipArchive archive, CompressionOption compressionLevel)
  69                 {
  70                         Archive = archive;
  71                         Archive.FileActive = true;
  72                         CompressionLevel = compressionLevel;
  73                         length = NativeUnzip.CurrentFileLength (Archive.Handle);
  74                 }
  75
  76                 public override void Close()
  77                 {
  78                         Archive.FileActive = false;
  79                         NativeUnzip.CloseCurrentFile (Archive.Handle);
  80                 }
  81
  82                 public override void Flush()
  83                 {
  84
  85                 }
  86
  87                 public override int Read(byte[] buffer, int offset, int count)
  88                 {
  89                         return NativeUnzip.Read (Archive.Handle, buffer, offset, count);
  90                 }
  91
  92                 public override long Seek(long offset, SeekOrigin origin)
  93                 {
  94                         throw new NotSupportedException ();
  95                 }
  96
  97                 public override void SetLength(long value)
  98                 {
  99                         throw new NotSupportedException ();
 100                 }
 101
 102                 public override void Write(byte[] buffer, int offset, int count)
 103                 {
 104                         throw new NotSupportedException ();
 105                 }
 106         }
 107 }